2013 Mercedes-Benz ML350 Smells Like Gas

Diagnosing Fuel Odor Issues in Your 2013 Mercedes-Benz ML350 and Essential Safety Precautions

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
15% chance it's the
Gas Cap
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40% chance it's the
Emissions Control System
0%
45% chance it's
Something else
The most common reasons a 2013 Mercedes-Benz ML350 smells like gas are the gas cap, the fuel system, or the emissions control system.
  • Gas Cap: A loose or damaged gas cap can cause fuel vapors to escape, triggering the check engine light and potentially affecting fuel system pressure.
  • Emissions Control System: A faulty emissions control system can lead to increased hydrocarbon emissions and trigger the check engine light due to malfunctioning components like the EGR valve or O2 sensors.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2013 Mercedes-Benz ML350 smells like gas?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

The check engine light will illuminate any time there is a failed EVAP system test. This will be indicated by the various on-board diagnostics trouble codes that are stored in the vehicle's memory. Also, in some models, there may be a popping sound accompanying the check engine light, as the leak detection pump continuously attempts to pressurize the fuel tank. The canister may also cause difficulty starting the engine, a rough idle, and poor fuel mileage.

The check engine light will illuminate any time there is a failed EVAP system test. This will be indicated by the various on-board diagnostics trouble codes that are stored in the vehicle's memory. Also, in some models, there may be a popping sound accompanying the check engine light, as the leak detection pump continuously attempts to pressurize the fuel tank. A fuel tank leak may also cause difficulty starting the engine, a rough idle, and poor fuel mileage. When a fuel tank is simply corroded to the point of failure, the exterior tank condition rarely shows damage. The inside of the fuel tank will be rusted or corroded, and rust flakes or other debris may be floating in the fuel.

For most vehicles, the only symptom will be a check engine light or fuel tank filler cap light illuminating on the driver instrument cluster. This is to signal that there is an evaporative emissions (EVAP) leak. In some situations, the vehicle may take longer than normal to start, or, more rarely, the engine may not start at all. on-board diagnostic (OBD) trouble codes will refer to EVAP system failures such as a small or massive EVAP system leak. Lastly, the powertrain control module may notice a lean running condition, which could even lead to random and infrequent misfires.

What are the potential causes and diagnostic steps for a gas smell in a 2013 Mercedes-Benz ML350?

When dealing with a gas smell in your 2013 Mercedes-Benz ML350, it's essential to adopt a systematic diagnostic approach to identify the underlying issue effectively. Start with a thorough visual inspection of the engine bay and undercarriage to spot any obvious signs of fuel leaks, as these can pose significant safety risks. Next, examine the fuel lines and connections for any damage or wear that could lead to leaks. It's also crucial to inspect the exhaust system, ensuring it is intact and functioning correctly, as exhaust issues can contribute to gas odors. If the check engine light is illuminated, utilize an OBD-II scanner to retrieve error codes, which can provide valuable insights into potential problems. Additionally, take note of when the gas smell occurs, particularly in relation to temperature changes or heater usage, as this can help narrow down the cause. If these initial checks do not reveal the source of the smell, or if you encounter any safety concerns, seeking a professional inspection from a qualified mechanic or a Mercedes-Benz service center is highly recommended to ensure your vehicle's safety and performance.

What could be causing a gas smell in my 2013 Mercedes-Benz ML350?

If you're detecting a gas smell in your 2013 Mercedes-Benz ML350, it's essential to investigate several common problems that could be the source of the issue. One of the first things to check is the gas cap; a loose or damaged cap can easily lead to fuel vapors escaping, creating a noticeable odor. Additionally, inspect the fuel system for any signs of leaks, particularly around low-pressure fuel hoses, as these can weep fuel at connection points and contribute to the smell. The emissions control system is another critical area to examine, as malfunctions here can also result in gas odors. Furthermore, consider the condition of the catalytic converter and the camshaft adjuster solenoid, as failures in these components have been reported in the ML350 model. Addressing these issues promptly is vital for both your safety and the vehicle's performance, making it a worthwhile DIY project for any car owner.

How urgent is it to address a gas smell in a 2013 Mercedes-Benz ML350?

Addressing a gas smell in your 2013 Mercedes-Benz ML350 is not just a matter of inconvenience; it is a pressing safety concern that requires immediate attention. Gas leaks pose a significant risk of fire or explosion, especially in the confined space of a vehicle, making it essential to act quickly. Additionally, inhaling gas fumes can lead to serious health issues, including dizziness and nausea, which can impair your ability to drive safely. Ignoring this warning sign can also result in further damage to your vehicle, leading to more extensive and costly repairs down the line. Therefore, if you detect a gas smell, it is crucial to seek professional assistance without delay to diagnose and resolve the issue, ensuring both your safety and the longevity of your vehicle.

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